<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    let num = +prompt("请输入一个数字")
    function getTime(time = 0) {
      let h = parseInt(time / 60 / 60 % 24)
      let m = parseInt(time / 60 % 60)
      let s = parseInt(time % 60)
      h = h < 10 ? "0" + h : h
      m = m < 10 ? "0" + m : m
      s = s < 10 ? "0" + s : s

      document.write(`转换后为时:${h},&nbsp;分:${m},&nbsp;秒:${s}`)
    }
    getTime(num);
  </script>
</body>

</html>